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CVE Record

CVE-2026-23142: mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure

In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure When a DAMOS-scheme DAMON sysfs directory setup fails after setup of access_pattern/ directory, subdirectories of access_pattern/ directory are not cleaned up. As a result, DAMON sysfs interface is nearly broken until the system reboots, and the memory for the unremoved directory is leaked. Cleanup the directories under such failures.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can leave the DAMON sysfs interface nearly unusable after a specific directory setup failure and leaks memory until reboot. The business impact appears operational rather than remotely compromising based on the supplied sources, but affected kernel fleets should still take vendor kernel updates seriously.

Executive priority

Treat as routine kernel maintenance unless DAMON is important to production monitoring or tuning. There is no supplied evidence of active exploitation, but affected systems can require reboot recovery after failure.

Technical view

The flaw is in mm/damon/sysfs-scheme cleanup logic. If DAMOS scheme sysfs directory setup fails after access_pattern/ is created, subdirectories are not removed. The fix adds cleanup for those subdirectories so DAMON sysfs state and memory are not left behind.

Likely exposure

Exposure is most likely on systems running affected Linux kernel builds where DAMON sysfs is enabled or used. The supplied affected-version data is limited and should be reconciled against distribution kernel advisories and backports.

Exploitation context

The source bundle does not show CISA KEV listing, active exploitation, public exploit availability, remote reachability, privilege impact, or confidentiality impact. Evidence supports an availability and resource-leak concern in a kernel subsystem.

Researcher notes

Focus review on DAMON sysfs scheme setup error paths and cleanup symmetry. The CVE record names fixed stable commits but does not provide CVSS, CWE, exploit status, or distro-specific package mappings.

Mitigation direction

  • Apply vendor kernel updates containing the referenced Linux stable fixes.
  • Check distribution advisories for backported fixed builds.
  • Reboot into the fixed kernel where your platform requires it.
  • If patching is delayed, follow vendor guidance for DAMON sysfs exposure.
  • Prioritize systems that actively use DAMON monitoring features.

Validation and detection

  • Inventory running kernel versions across Linux hosts.
  • Confirm whether DAMON sysfs is enabled or used.
  • Verify the installed kernel includes a referenced stable fix or vendor backport.
  • Review monitoring for DAMON sysfs failures or unexplained kernel memory leakage.
  • Retest DAMON-dependent operational workflows after updating.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2026-23142 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
6Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990, 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990, 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990, 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990, 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990unaffected
LinuxLinux5.18, 0, 6.1.162, 6.6.122, 6.12.67, 6.18.7, 6.19affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.